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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Clean the tool_monitor_events table.
*
* @package tool_monitor
* @copyright 2014 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace tool_monitor\task;
/**
* Simple task to clean the tool_monitor_events table.
*/
class clean_events extends \core\task\scheduled_task {
/**
* Get a descriptive name for this task.
*
* @return string
*/
public function get_name() {
return get_string('taskcleanevents', 'tool_monitor');
}
/**
* Performs the cleaning of events.
*/
public function execute() {
global $DB;
if (!get_config('tool_monitor', 'enablemonitor')) {
return; // The tool is disabled. Nothing to do.
}
// Array to store which events have been triggered in which course.
$courses = array();
// Firstly, let's go through the site wide rules. There may be multiple rules for the site that rely on
// the same event being triggered, so we only remove the events when they reach the max timewindow.
if ($siterules = $DB->get_recordset('tool_monitor_rules', array('courseid' => 0), 'timewindow DESC')) {
// Go through each rule and check if there are any events we can remove.
foreach ($siterules as $rule) {
// Check if we have already processed this event.
if (isset($courses[$rule->courseid][$rule->eventname])) {
continue;
}
// Store the timewindow for this event.
$courses[$rule->courseid][$rule->eventname] = $rule->timewindow;
// Delete any events that may exist that have exceeded the timewindow.
$DB->delete_records_select('tool_monitor_events', 'eventname = :eventname AND
courseid = :courseid AND timecreated <= :timewindow',
array('eventname' => $rule->eventname, 'courseid' => $rule->courseid,
'timewindow' => time() - $rule->timewindow));
}
// Free resources.
$siterules->close();
}
// Now, get the course rules. The same applies here - there may be multiple rules for the course that rely on
// the same event being triggered, so we only remove the events when they reach the max timewindow.
if ($rules = $DB->get_recordset_select('tool_monitor_rules', 'courseid != 0', array(), 'timewindow DESC')) {
// Go through each rule and check if there are any events we can remove.
foreach ($rules as $rule) {
// Check if we have already processed this event for this particular course.
if (isset($courses[$rule->courseid][$rule->eventname])) {
continue;
}
// Add the course and event to the list.
$courses[$rule->courseid][$rule->eventname] = $rule->timewindow;
// If there is a site wide rule listening for this event do not remove it unless the maximum
// timewindow between the two has exceeded.
$timewindow = $rule->timewindow;
if (isset($courses[0][$rule->eventname]) && ($courses[0][$rule->eventname] > $timewindow)) {
$timewindow = $courses[0][$rule->eventname];
}
// Delete any events that may exist that have exceeded the timewindow.
$DB->delete_records_select('tool_monitor_events', 'eventname = :eventname AND
courseid = :courseid AND timecreated <= :timewindow',
array('eventname' => $rule->eventname, 'courseid' => $rule->courseid,
'timewindow' => time() - $timewindow));
}
// Free resources.
$rules->close();
}
if ($siterules || $rules) { // Check that there are rules present.
// Get a list of all the events we have been through.
$allevents = array();
foreach ($courses as $key => $value) {
foreach ($courses[$key] as $event => $notused) {
$allevents[] = $event;
}
}
// Remove all the events in the table that are not applicable to any rule. There may be a rule in one course
// listening for a certain event, but not in another course, so we can delete the event from the course
// where there is no rule. We also have to consider site wide rules. We may have an event that is triggered
// in a course we can't remove because there is a site wide rule for this event.
if ($events = $DB->get_recordset('tool_monitor_events')) {
// Array to store which events we need to remove.
$eventstodelete = array();
// Store the current time.
$now = time();
foreach ($events as $event) {
// If the event is not required for a course rule and there is no site wide rule for it, or
// it has extended past or equal to the timewindow for the site rule - it can be deleted.
if (!isset($courses[$event->courseid][$event->eventname]) && (!isset($courses[0][$event->eventname])
|| $courses[0][$event->eventname] <= ($now - $event->timecreated))) {
$eventstodelete[] = $event->id;
}
}
// Free resources.
$events->close();
// Remove the events.
if (!empty($eventstodelete)) {
list($eventidsql, $params) = $DB->get_in_or_equal($eventstodelete);
$DB->delete_records_select('tool_monitor_events', "id $eventidsql", $params);
}
}
// Remove all the events in the table that are not used by any rule.
if (!empty($allevents)) {
list($eventnamesql, $params) = $DB->get_in_or_equal($allevents, SQL_PARAMS_QM, 'param', false);
$DB->delete_records_select('tool_monitor_events', "eventname $eventnamesql", $params);
}
} else { // No rules, just remove everything.
$DB->delete_records('tool_monitor_events');
}
}
}